Incandescent lamp.



Jlfmfrss- PATENT@ JULY'zmfleus.

wf .wl INANDESCENT LAMP. APPLICATION FILED, AUG. 9| 1902- WILLIAM W. DEAN, OF CHICAGO, ILLINOIS,

UNITED sTATEs PATENT onnion.

lASSIGOR TO KELLOGG SWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

INCANDESCENT LAMP.

Specification of Letters Patent.

. Patented Juiy 2s, 1908-.'V

Application vfiled August 9, 1902. Serial No.:118,990.

To all whom it may concern:

Be it known that I, WILLIAM W. DEAN, a citizen of the United States of America, and resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Incandescent Lamps, of whichthe following is a specification.

My inventionrelates to improvements in small incandescent lamps of the type used as .reference .being had to the accom anying drawing forming a part hereof in W ich the '-same reference characters designate like parts throughout the seve Which;

Figure 1 is a side elev tion of the lamp. Fig. 2 is an elevational view of the side of the Fig. 3

is a bottom plan view thereof. Fig'. 4 is a glass bulb and 3,

sectional view of the Aline f4 of Fig. 2. Fig. 5 is a sectional view on the line '5-5 Fig. 1, and Fig. 6 is a view of the bulb and terminalsv before assembling.

In these figures Zdesignates the cylindrical 3 the terminals which eX- teiid along the sides of the bulb as shown, andare preferably cemented thereto. These terminals comprise stampings `of thin sheet metal preferably brass which are curved transversely' so as to iit thescurvature of the .bulb and are of such length as to project beyond the end of the buIb. These ends are4 extended slightly .at the edges 4, 4 so that the opposed edges 4;, 4 of the terminals when springs of the lamp jack in lace form substantially an inclosing cylin er and are slanted or beveled 0H at 5 to provide a Wedging surface so that the end of the lamp is wedge shaped as shown in the drawings, to enable it to be readily inserted between the lamp .holding springs of the lam spring jack. Longitudinal ridges 6, 6 are ormed inthe terminals 3 with which the engage to insure the position of the lamp in the jack and at the same time provide-additional electrical contact therewith. The upper ends of the ter- .nn'n'als have roundedcorners 7, which serve V to guide the s the base which preferably raf views and in ring jaws ofthe lamp removing tool into t e space between the terminals the terminals and tearing them away from provided with inwardly turned lips or `projections 8, 8 and with the upturned lip 9 at its eXtreme its leading in wires soldered to the terminals 3, as at 12 or at any other convenient loca- When the parts f the lamp shown in Fig. 6 are assembled, the insulating material v13of consists of an insu.- ,latiiig cement such as plast'er-` of paris is caused tofill in the s minals and the end of t e bulb. The cement being in a plastic or semi liquid condition, thus fills inaroundthe lips orluv's, 8,. 8 and 9, 9..,Whereby when it solidifies the said terminals are firmly supported and secured together and to the bulb, the cement adhering to the surface of both bulb and terminals.

By this means a lamp base is provided that nity to catch and tear loff the terminals when the lamps are inserted inthe spring Jacks. Another advantage of this type of lamp is iii the fact that the inaccuracies ofthe glass tubing of which the bulbs are made do not render the manufacture of the lamp diflicult and do `not affect the completed article, since the' terminals are merely cemented to theside ofthe bulb and the projecting ends in size or shape are notnoticed. Of course, any suitable cement may be used and even any insulating material may be substituted therefor', but not with the sameadvantageous results as with an insulating cement that is adapted toibe forced into the said space in a li uid or plastic condition so as to completely l in around all parts and every crevice and which Yupon solidifying adheres comes solid so as to Withstandcompression. Itis obvious that other changes may be made in my invention and I do nottherefore wish to be limited in all rrespects to the precise details'shown and described. v

Having -thus described my invention, what Iclaimis;

1. In a small incandescent lamp, the-comand thusprevent the same from catching on' the bulb. The edges 4, 4 of the terminals are.

is extremely simple and inexpensive to maniifacture and in which there is no opportu A filled in with cement so that `slight'variationsv lower end. The filament-10 has ace between the terf to the said' parts and at the same .time bebination with a' cylindrical bulb, of a pair of 110 I terminal strips mounted .upon the sides of said bulb, said terminals continuing beyond the end of the bulb to the end of the base and forming a portion of its outer sinface, said strips having longitudinal ridges formed therein to form an engaging surface for the jack s rings, substantially as described.

2.- n a 'small incandescent lamp, the comi' bination with` a cylindrical bulb, ofa pair'of '1e opposed terminal strips cemented to the sides thereof, lsaid terminals continuing beyond the end of the bulb to the end of the base and being beveled inwardly at their ends and forming a portion of the outer surface'of the base, longitudinal ribs formed in said terminals upon -eachf side of the center line thereof to provide engaging surfaces for the-jack springs, and an insulating and supporting lling between said terminal ends,

substantially as described.

3; In a small incandescent lamp, the combination With a cylindrical bulb, of stamped thin sheet metal terminals cemented'to the opposite sides thereof and extending beyond t e ing inwardly turned edges forming nearly an b inciosed cylinder and each lhaving a beveled outer surface at its end to together form av Wedge shaped end of the base, said inclosed\ end of the saine, said extendingiends hav- Y cylinder being iilled with an insulating ce? ment, substantially as described.

4. In .a telephone lamp, the combination With a cylindrical bulb, of terminal strips extending along the sides of the bulb and beyond the end thereof, and having parallel extending along the sides and beyond theend thereof, the extended ends of said strips having a beveled portion formed therein, whereby contacts sf the lamp socket will be spread apart when the lamp is inserted therein, extensions at the ends of said beveled portions, and a cement within said beveled portion engaging said extensions to maintain the terminal strips in position, substantially as described. 1 l

Signed by me at Chicago, county of'Cook,

V State of Illinois, this 12th day of June, 1902.

WILLIAM WV. DEAN IWitnesses yPonnnr Lnws AMES,

M. I-IENDEE. 

